Six former shipyard workers claimed that they were suffering from asbestosis and asbestos-related pleural disease caused by their workplace exposure to asbestos over a 30-year period.   Defense counsel Edward Hugo called no witnesses and presented no evidence, but relied solely on cross-examination and argued burden of proof.   After a two-month trial, the jury found for the defense in all six instances. (Lawrence v. AC&S Inc. (Owens Corning), San Francisco Superior Court, 2/18/97)